1 definition by ColyPoly
A genre of fanfiction centered around a fictional romantic/sexual relationship between lesbian twin sisters, Tegan and Sara Quin of the band Tegan and Sara.
tsfan1: Do you think Tegan and Sara are really in love with each other?
tsfan2: I'm not sure, but quincest sure is fun to read about!
tsfan2: I'm not sure, but quincest sure is fun to read about!
by ColyPoly July 27, 2010